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S32750 Duplex Stainless Steel Tube – Quality China Suppliers & Factory with Fast Shipping!
Introduction
ASTM A270 covers seamless and welded austenitic stainless steel tubing for sanitary applications in industries requiring high purity and corrosion resistance. S32750 (also known as UNS S32750 or Zeron 100) is a super duplex stainless steel with an austenitic-ferritic microstructure, offering exceptional corrosion resistance, strength, and durability.
S32750 is the preferred choice for extreme hygiene environments where both aggressive corrosion risks (e.g., high Cl⁻, low pH) and mechanical stress (e.g., high-pressure systems) are present. Its combination of super duplex properties ensures longevity and compliance in the most demanding sanitary applications.
Key Features
Exceptional Corrosion Resistance
PREN (Pitting Resistance Equivalent Number) of ~40–43, surpassing standard duplex (e.g., S32205) and austenitic grades. Resists corrosion in environments with Cl⁻ > 1,000 ppm or low pH (e.g., pH < 3).
Superior Mechanical Strength
Yield strength ~2.5× higher than 316L stainless steel, enabling thinner-walled tubing for the same pressure rating. Reduces material costs and installation complexity in large-scale systems.
Hygienic and Low-Maintenance Design
Electropolished surfaces minimize biofilm formation, critical for preventing microbial contamination in long-term use. Reduces the need for frequent disassembly and manual cleaning.
Temperature Stability
Performs reliably in wide temperature ranges (-20°C to 300°C), making it suitable for hot CIP cycles (e.g., 130°C steam) and cold storage systems (e.g., glycol-cooled lines at -10°C).
Material Specification
Standard
ASTM A270/A270M
O.D Range
1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)
Wall Thickness (W.T)
SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Applications
- Pharmaceutical and Biopharmaceutical Manufacturing
- Food and Beverage Industry (Aggressive Environments)
- Cosmetics and Personal Care Production
- High-Purity Water and Steam Systems
- Marine and Offshore Sanitary Systems
End Types
Plain End, Beveled End, Threaded
Processing Options
Cut-to-length, Polishing
Inspection & Testing
- 100% PMI TESTED
- EN10204.3.1B MILL TEST CERTIFICATE
- THIRD PARTY INSPECTION ACCEPTED
Delivery Condition
Cold Drawn, Annealed and Pickled / Polished / Bright Annealed / Sand blasting / Shot Blasting
Marking
All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per customer's request)
Packing
Packed in Wooden Boxes, Plywood Cases, Steel Strips Bundled, or as per Customers Requests
Specials
Sizes and Specifications other than standard sizes can be customized on request.
Specification Parameters
S32750 Chemical Composition
| Heat No. | Chemical Composition (%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | ||
| Stand. | Min. | - | - | - | - | - | 6.00 | 24.00 | 3.00 | 0.24 | - |
| Max. | 0.030 | 1.20 | 0.035 | 0.020 | 0.8 | 8.00 | 26.00 | 5.00 | 0.32 | 0.50 | |
S32750 Mechanical Properties
| Mechanical Properties | |||||
|---|---|---|---|---|---|
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| HRW | |||||
| S32750 | 655 | 485 | 25 | C32 | |
Equivalent Grades - (ASTM A270/A270M S32750 Equivalent Grades)
| ASTM A270/A270M S32750 (UNS S32750 / 2507) Equivalent Grades | ||||||
|---|---|---|---|---|---|---|
| ISO | EN (Europe) | DIN (Germany) | JIS (Japan) | GB (China) | UNS (USA) | Common Name |
| X2CrNiMoN25-7-4 (ISO 15510) |
1.4410 (EN 10088-2) |
X2CrNiMoN25-7-4 (DIN 17440) |
SUS 329J4L (JIS G3463) |
022Cr25Ni7Mo4N (GB/T 21833) |
S32750 | 2507 (Super Duplex) |
ASTM A269/A269M Standard Cold Machining Size Deviation Permitted
| ASTM A269/A269M Standard cold machining size deviation permitted | ||||||
|---|---|---|---|---|---|---|
| Group | Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Wall Thickness, A% | Permissible Variations in Cut Length, in. [mm] B | Thin Walled Tubes C | |
| Over | Under | |||||
| 1 | Up to 1/2 [13] | ±0.005 [0.13] | ±15 | 1/8 [3.2] | 0 | ... |
| 2 | 1/2 to 1 1/2 [13 to 38], excl | ±0.005 [0.13] | ±10 | 1/8 [3.2] | 0 | less than 0.065 in. [1.65 mm] nominal |
| 3 | 1 1/2 to 3 1/2 [38 to 89], excl | ±0.010 [0.25] | ±10 | 3/16 [4.8] | 0 | less than 0.095 in. [2.41 mm] nominal |
| 4 | 3 1/2 to 5 1/2 [89 to 140], excl | ±0.015 [0.38] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 5 | 5 1/2 to 8 [140 to 203], excl | ±0.030 [0.76] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 6 | 8 to 12 [203 to 305], excl | ±0.040 [1.01] | ±10 | 3/16 [4.8] | 0 | less than 0.200 in. [5.08 mm] nominal |
| 7 | 12 to 14 [305 to 356], excl | ±0.050 [1.26] | ±10 | 3/16 [4.8] | 0 | less than 0.220 in. [5.59 mm] nominal |
Frequently Asked Questions
What is ASTM A270 S32750?
ASTM A270 S32750 is a super duplex stainless steel tubing standard specifying seamless and welded austenitic-ferritic stainless steel tubing. It is designed for sanitary applications requiring extreme purity, durability, and high resistance to aggressive corrosion.
What makes S32750 superior to 316L stainless steel?
S32750 offers a yield strength that is approximately 2.5 times higher than 316L. This allows for thinner-walled tubing designs under identical pressure ratings, significantly lowering material weight, costs, and installation complexity.
How does S32750 perform in highly corrosive environments?
S32750 features a high Pitting Resistance Equivalent Number (PREN) of ~40–43. This makes it highly resistant to pitting and crevice corrosion in environments with chloride levels exceeding 1,000 ppm or in low pH systems (pH < 3).
In which industries is ASTM A270 S32750 tubing typically used?
It is widely used in pharmaceutical and biopharmaceutical manufacturing, the food and beverage industry in aggressive environments, cosmetics and personal care production, high-purity water and steam systems, and marine/offshore sanitary systems.
What is the operating temperature range for S32750 tubing?
S32750 operates reliably across a wide temperature range from -20°C to 300°C. This makes it suitable for both hot Clean-in-Place (CIP) cycles (such as 130°C steam) and cold storage systems (such as glycol-cooled lines at -10°C).